Which statement is NOT true?

A. If x = 10, then x2 = 100.
B. x2 = 100 if and only if x = 10 or x = –10.
C. If x = –10, then x2 = 100.
D. If x2 = 100, then x = 10.

Question

Which statement is NOT true?
 	
	A. If x = 10, then x2 = 100.
	B. x2 = 100 if and only if x = 10 or x = –10.
	C. If x = –10, then x2 = 100.
	D. If x2 = 100, then x = 10.

ganeshie8 · Answer

check the last one once

anonymous · Answer

D.

Because, 

A. $$10 * 10 = 100$$
B. $$10 * 10 = 100, -10 * - 10 = 100$$ (negative times a negative.)
C. Same as above, -10*-10 = 100
D. If x^2 = 100, then x can be -10, or 10.